This works by setting DF-bit to 1 and forcing MTU size. Most networking devices use Path MTU to calculate proper MTU size on the entire path. IEEE 802.1Q tag adds 4 bytes (Q-in-Q would add 8 bytes).MPLS adds 4 bytes for each label in the stack.IPSec encryption performed by the DMVPN adds 73 bytes for ESP-AES-256 and ESP-SHA-HMAC overhead (overhead depends on transport or tunnel mode and the encryption/authentication algorithm and HMAC).Any encapsulation that takes place, adds overhead to the original packet size: MTU size for Ethernet is 1500 (1514 if we count 802.1 Ethernet header).When original IP packet gets encrypted by IPSec, there’s an overall increase in packet size. Common example is when icmp ping works both way without any issues, or manual telnet to www port is open but the actual page won’t open or opens intermittently. This is caused by incorrect MTU size and encapsulation overhead. Very often when IPSec tunnel is used, throughput is affected or users are experiencing fragmentation issues. Start and de-allocate VM from CLI in Azure.Palo Alto search for SSL decrypted packets.Determining MTU size for VPN connections.
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